A little shy girl, Lisa, is chasing after her escaped puppy on the beach. Just when she was about to give up, a kid surfer, Kazuya, comes out from the water. Kazuya uses his surfboard and 'leash' to capture the fugitive. A few years later, under the scorching sun, Lisa is practicing surfing using the 'leash' that Kazuya gave her 6 years ago. But during her practice, her irreplaceable leash gets torn apart by an accident with a male surfer. Lisa starts complaining about the leash and the two start to argue.